im going by what the guy at the nearest tunning store told me im just getting into actual racing so i dont realy kno a whole lot

 

well that guy is an asshat... you dont need to touch the Cat unless ur gonna get a new set of headers.... and as for racing seats...... you aren't gonna go fast enough to need them the harnesses are a nice touch though, specially if ur seat belts keep tightening up on you when ur driving like mine do .... just remember to get urself the harness mounting kit and a 5 point harness is useless unless you have a roll cage with a harness bar... i mean u aren't gonna need that 5th strap.... so go with a 4 point harness mush easier install and generally cheaper.... trust me you aren't gonna go fast enough to need it in the first place so a 4 point will do just fine